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JP3751223B2 - Eccentric facing unit - Google Patents

Eccentric facing unit Download PDF

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Publication number
JP3751223B2
JP3751223B2 JP2001177889A JP2001177889A JP3751223B2 JP 3751223 B2 JP3751223 B2 JP 3751223B2 JP 2001177889 A JP2001177889 A JP 2001177889A JP 2001177889 A JP2001177889 A JP 2001177889A JP 3751223 B2 JP3751223 B2 JP 3751223B2
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JP
Japan
Prior art keywords
tool
shaft
spindle
axis
facing unit
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
JP2001177889A
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Japanese (ja)
Other versions
JP2002370103A (en
Inventor
義孝 石田
幹男 橋井
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Yamashina Seiki Co Ltd
Original Assignee
Yamashina Seiki Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Yamashina Seiki Co Ltd filed Critical Yamashina Seiki Co Ltd
Priority to JP2001177889A priority Critical patent/JP3751223B2/en
Priority to US09/992,118 priority patent/US6565298B2/en
Priority to KR1020020003525A priority patent/KR100821285B1/en
Publication of JP2002370103A publication Critical patent/JP2002370103A/en
Application granted granted Critical
Publication of JP3751223B2 publication Critical patent/JP3751223B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B29/00—Holders for non-rotary cutting tools; Boring bars or boring heads; Accessories for tool holders
    • B23B29/04—Tool holders for a single cutting tool
    • B23B29/12—Special arrangements on tool holders
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B29/00—Holders for non-rotary cutting tools; Boring bars or boring heads; Accessories for tool holders
    • B23B29/03—Boring heads
    • B23B29/034—Boring heads with tools moving radially, e.g. for making chamfers or undercuttings
    • B23B29/03432—Boring heads with tools moving radially, e.g. for making chamfers or undercuttings radially adjustable during manufacturing
    • B23B29/03478—Boring heads with tools moving radially, e.g. for making chamfers or undercuttings radially adjustable during manufacturing by means of an eccentric
    • B23B29/03482—Boring and facing heads
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T409/00—Gear cutting, milling, or planing
    • Y10T409/30—Milling
    • Y10T409/306664—Milling including means to infeed rotary cutter toward work
    • Y10T409/30756—Machining arcuate surface
    • Y10T409/307616—Machining arcuate surface with means to move cutter eccentrically
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T82/00—Turning
    • Y10T82/12—Radially moving rotating tool inside bore
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T82/00—Turning
    • Y10T82/12—Radially moving rotating tool inside bore
    • Y10T82/122—Forming non-circular bore

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Cutting Tools, Boring Holders, And Turrets (AREA)
  • Turning (AREA)
  • Jigs For Machine Tools (AREA)
  • Drilling And Boring (AREA)

Description

【０００１】
【発明が属する技術分野】
この発明は、工具軸すなわちフェーシング工具（正面バイト）保持軸をスピンドルに対して偏心させて配置したフェーシングユニットの改良に関するものである。
【０００２】
【従来の技術】
この種のフェーシングユニットとしては、工具軸をスピンドルに対して相対的に回転させることにより、スピンドルの軸心（軸線）に対する工具の切刃の半径方向の距離（刃先の離心量）を変化させて、フェーシング切削を行うものが知られている。
【０００３】
この周知のフェーシングユニットは、回転系のみの構成のため、半径方向のストローク全体を通して、バランス取りが容易であるなどの利点を有しているが、機構上切削抵抗などが変化する点から好ましくない切刃のすくい角の変化が回避できないとともに、特にこのすくい角の変化は、半径方向のストロークが大きくなればなる程大きくなることから、その用途は、すくい角の変化が比較的小さい切刃の小ストロークのフェーシング切削に限定されている。
【０００４】
【発明が解決しようとする課題】
この発明は、上記のような点に鑑み、偏心式フェーシングユニットとして、バランス取りの容易な回転系のみからなるとともにすくい角が不変のものを提供することを課題としている。
【０００５】
【課題を解決するための手段】
この発明に係る偏心式フェーシングユニットは、スピンドルに、工具駆動軸により回転駆動する工具軸装着軸を偏心させて装着し、該工具軸装着軸に、工具駆動軸にオルダム継手機構を介して同速回転するように連結した工具軸を、工具軸装着軸のスピンドルに対する偏心量と同量偏心させて装着し、かつ工具軸装着軸と工具駆動軸を、工具軸装着軸が工具駆動軸と同速回転する工具軸の２倍の角度回転するように、歯車伝動機構を介して伝動連結した構成からなる。
【０００６】
この発明の偏心式フェーシングユニットは、要約すれば、図１に略示するように、スピンドルの軸心Ｏから等間隔をおいて工具軸装着軸の軸心Ｐと工具軸の軸心Ｑを配置し、軸心ＱからＲを切刃の先端とするフェーシング工具を延在させるとともに、工具軸装着軸に属する線分ＰＱが軸心Ｐの周りに角度θ回転して、軸心ＱがＱ’まで移動する際に、フェーシング工具に属する線分ＱＲがＱ’の周りにθ／２の角度回転して、Ｑ’Ｒ’の位置を占めるように構成するもので、この構成によれば、線分Ｑ’Ｒ’の延長線、すなわち切刃Ｒの切削方向に直交する面は常にスピンドルの軸心Ｏを通る形になるので、切刃のすくい角は常に一定である。
【０００７】
またこの発明のフェーシングユニットにおいては、工具駆動軸と工具軸のオルダム継手機構を介した連結により、工具軸装着軸及び工具軸の偏心量に関する加工誤差、すなわち図１におけるＯＰ間及びＰＱ間の距離に関する加工誤差が適確に補償（吸収）される。
【０００８】
【発明の実施の形態】
以下図２〜図４に基づいて、この発明のフェーシングユニットの一実施形態を説明する。
【０００９】
図示した形態では、スピンドル１１（軸心Ｏ）の先端域に隣接する内奥部に、スピンドル１１と同心的にのびる工具駆動軸１２が装着されている一方、スピンドル１１の先端域の内部に、スピンドル１１に対して偏心した工具軸装着軸１６が装着され、この工具軸装着軸１６（軸心Ｐ）の内部に、そのスピンドル１１に対する偏心量と同量偏心した工具軸２１（軸心Ｑ）の後半部が装着されている。
【００１０】
工具駆動軸１２は、先端部に駆動歯車１３を備えており、この駆動歯車１３の先端側には突起１５付きのオルダム継手機構のハブ（ボス）１４が付設されている。
【００１１】
工具軸装着軸１６は、後端部に、左右一対の中間歯車１８、１９を介してスピンドル１１の駆動歯車１２に伝動連結した従動歯車１７を備えており、この工具駆動軸１２から工具軸装着軸１６への歯車伝動によって、工具駆動軸１２の２倍の回転速度で回転するようになっている。
【００１２】
工具軸２１は、先端部に切刃２７付きのフェーシング工具２６を保持する一方、後端部に、突起２３付きのオルダム継手機構のハブ２２を備えており、このハブ２２はハブ１４と、前後に突起２３、１５のそれぞれがスライド係合する溝２５を有するオルダム継手機構の中間部材２４を介して連結されて、工具軸２１が工具駆動軸１２と同速度で回転するようになっている。
【００１３】
この実施形態においては、図１で説明したように、工具軸装着軸１６が 工具駆動軸１２から駆動歯車１３、従動歯車１７及び中間歯車１８、１９を含む歯車伝動機構を介して、スピンドル１１に対して角度θ回転する際には、工具軸１２が、突起１５、２３付きのハブ１３、２２と溝２５付きの中間部材２４を含むオルダム継手機構を介して、工具駆動軸１２と同様に、工具軸装着軸１６に対してθ／２回転し、切刃２７の切削方向に直交する面は常にスピンドル１１の軸心を通る。すなわち切刃２７のすくい角は変化を受けず、常に一定に保持される。またオルダム継手機構を介した工具軸２１と工具駆動軸１２の連結によって、工具軸装着軸１６と工具軸２１の偏心上の加工誤差が適確に吸収される。
【００１４】
【発明の効果】
以上説明したように、この発明の偏心式フェーシングユニットによれば、切刃のすくい角は、半径方向のストロークや変化する刃先の離心量に関係なく、普遍である。従って常に切削抵抗等が一定の安定した切削を行うことができる。また工具駆動軸と工具軸をオルダム継手機構を介して連結するので、工具軸装着軸と工具軸の偏心上の加工誤差を適確に吸収することができる。
【００１５】
又このフェーシングユニットによれば、フェーシング工具の遠心力がその軸受に受け止められて、スピンドルの回転モーメントに作用することがないので、スピンドルの軸心を含めて全ストロークで安定した送りや位置決めを行うことができる。
【００１６】
さらにこのフェーシングユニットは、密封性に優れるとともに小型化可能な簡単な構造であることから、高速ボーリングやリセッシング加工のために好適である。
【図面の簡単な説明】
【図１】この発明に係るフェーシングユニットにおける切刃の回転状態の説明図である。
【図２】この発明のフェーシングユニットの一実施形態の略正断面図である。
【図３】図１に示す実施形態の略平断面図である。
【図４】図１に示す実施形態の略左側面図である。
【符号の説明】
１１ スピンドル
１２ 工具駆動軸
１３ 駆動歯車
１４ オルダム継手ハブ
１６ 工具軸装着軸
１７ 従動歯車
１８ 中間歯車
１９ 中間歯車
２１ 工具軸
２２ オルダム継手ハブ
２４ オルダム継手中間部材
２６ フェーシング工具
２７ 切刃
Ｏ スピンドルの軸心
Ｐ 工具装着軸の軸心
Ｑ 工具軸の軸心[0001]
[Technical field to which the invention belongs]
The present invention relates to an improvement of a facing unit in which a tool shaft, that is, a facing tool (front tool) holding shaft is arranged eccentrically with respect to a spindle.
[0002]
[Prior art]
In this type of facing unit, by rotating the tool axis relative to the spindle, the radial distance of the cutting edge of the tool (the amount of eccentricity of the cutting edge) relative to the spindle axis (axis) is changed. What performs facing cutting is known.
[0003]
This well-known facing unit has an advantage that it is easy to balance through the entire radial stroke because it is composed only of a rotating system. However, this is not preferred because the cutting resistance changes due to the mechanism. The change in the rake angle of the cutting edge cannot be avoided. In particular, the change in the rake angle becomes larger as the radial stroke becomes larger. Limited to small stroke facing cutting.
[0004]
[Problems to be solved by the invention]
In view of the above points, an object of the present invention is to provide an eccentric facing unit that includes only a rotating system that can be easily balanced and has an invariable rake angle.
[0005]
[Means for Solving the Problems]
An eccentric facing unit according to the present invention is mounted on a spindle by decentering a tool shaft mounting shaft that is rotationally driven by a tool driving shaft, and the tool shaft mounting shaft is connected to the tool driving shaft at the same speed via an Oldham coupling mechanism. The tool shafts connected so as to rotate are mounted with the same amount of eccentricity with respect to the spindle of the tool shaft mounting shaft, and the tool shaft mounting shaft and the tool drive shaft are mounted at the same speed. It consists of the structure which carried out transmission connection through the gear transmission mechanism so that it might rotate twice as much as the tool axis to rotate.
[0006]
In summary, the eccentric facing unit of the present invention is arranged with a tool shaft mounting shaft axis P and a tool shaft axis Q spaced equidistant from the spindle axis O as schematically shown in FIG. Then, the facing tool having R as the tip of the cutting blade is extended from the axis Q, and the line segment PQ belonging to the tool axis mounting axis is rotated by an angle θ around the axis P, so that the axis Q is Q ′. The line segment QR belonging to the facing tool is rotated by an angle of θ / 2 around Q ′ and occupies the position of Q′R ′. Since the extension line of the minute Q′R ′, that is, the plane perpendicular to the cutting direction of the cutting edge R, always passes through the axis O of the spindle, the rake angle of the cutting edge is always constant.
[0007]
Further, in the facing unit of the present invention, due to the connection between the tool drive shaft and the tool shaft through the Oldham coupling mechanism, the machining error related to the eccentric amount of the tool shaft mounting shaft and the tool shaft, that is, the distance between OP and PQ in FIG. The processing error is accurately compensated (absorbed) .
[0008]
DETAILED DESCRIPTION OF THE INVENTION
An embodiment of the facing unit of the present invention will be described below with reference to FIGS.
[0009]
In the illustrated form, a tool drive shaft 12 extending concentrically with the spindle 11 is mounted in the inner back part adjacent to the tip region of the spindle 11 (axial center O), while inside the tip region of the spindle 11, A tool shaft mounting shaft 16 that is eccentric with respect to the spindle 11 is mounted. Inside the tool shaft mounting shaft 16 (axis center P), a tool shaft 21 (axis center Q) that is eccentric by the same amount as the amount of eccentricity with respect to the spindle 11 is mounted. The second half of is installed.
[0010]
The tool drive shaft 12 is provided with a drive gear 13 at the tip, and a hub (boss) 14 of an Oldham joint mechanism with a protrusion 15 is attached to the tip of the drive gear 13.
[0011]
The tool shaft mounting shaft 16 is provided with a driven gear 17 at the rear end thereof, which is connected to the drive gear 12 of the spindle 11 via a pair of left and right intermediate gears 18 and 19. The gear is transmitted to the shaft 16 so that it rotates at twice the rotational speed of the tool drive shaft 12.
[0012]
The tool shaft 21 holds a facing tool 26 with a cutting edge 27 at the front end portion, and has a hub 22 of an Oldham coupling mechanism with a projection 23 at the rear end portion. The projections 23 and 15 are connected to each other via an intermediate member 24 of an Oldham coupling mechanism having a groove 25 for sliding engagement, so that the tool shaft 21 rotates at the same speed as the tool drive shaft 12.
[0013]
In this embodiment, as described with reference to FIG. 1, the tool shaft mounting shaft 16 is moved from the tool drive shaft 12 to the spindle 11 via a gear transmission mechanism including a drive gear 13, a driven gear 17, and intermediate gears 18, 19. When the tool shaft 12 rotates at an angle θ relative to the tool drive shaft 12 via the Oldham coupling mechanism including the hubs 13 and 22 with the protrusions 15 and 23 and the intermediate member 24 with the groove 25, A surface that rotates θ / 2 with respect to the tool shaft mounting shaft 16 and that is perpendicular to the cutting direction of the cutting edge 27 always passes through the axis of the spindle 11. That is, the rake angle of the cutting edge 27 is not changed and is always kept constant. Further, due to the connection between the tool shaft 21 and the tool drive shaft 12 via the Oldham coupling mechanism, the machining error on the eccentricity of the tool shaft mounting shaft 16 and the tool shaft 21 is accurately absorbed.
[0014]
【The invention's effect】
As described above, according to the eccentric facing unit of the present invention, the rake angle of the cutting edge is universal regardless of the radial stroke and the changing amount of eccentricity of the cutting edge. Therefore, stable cutting with constant cutting resistance and the like can always be performed. Further, since the tool drive shaft and the tool shaft are connected via the Oldham coupling mechanism, machining errors due to eccentricity of the tool shaft mounting shaft and the tool shaft can be absorbed accurately.
[0015]
Further, according to this facing unit, the centrifugal force of the facing tool is received by the bearing and does not act on the rotational moment of the spindle, so that stable feeding and positioning are performed over the entire stroke including the spindle center. be able to.
[0016]
Furthermore, this facing unit is suitable for high-speed boring and recessing because it has a simple structure that is excellent in sealing performance and can be miniaturized.
[Brief description of the drawings]
FIG. 1 is an explanatory diagram of a rotating state of a cutting blade in a facing unit according to the present invention.
FIG. 2 is a schematic front sectional view of an embodiment of a facing unit according to the present invention.
FIG. 3 is a schematic cross-sectional view of the embodiment shown in FIG.
4 is a schematic left side view of the embodiment shown in FIG. 1. FIG.
[Explanation of symbols]
11 Spindle 12 Tool drive shaft 13 Drive gear 14 Oldham joint hub 16 Tool shaft mounting shaft 17 Drive gear 18 Intermediate gear 19 Intermediate gear 21 Tool shaft 22 Oldham joint hub 24 Oldham joint intermediate member 26 Facing tool 27 Cutting edge 27 Spindle axis P Center axis of tool mounting axis Q Center axis of tool axis

Claims (1)

スピンドルに、工具駆動軸により回転駆動する工具軸装着軸を偏心させて装着し、該工具軸装着軸に、工具駆動軸にオルダム継手機構を介して同速回転するように連結した工具軸を、工具軸装着軸のスピンドルに対する偏心量と同量偏心させて装着し、かつ工具軸装着軸と工具駆動軸を、工具軸装着軸が工具駆動軸と同速回転する工具軸の２倍の角度回転するように、歯車伝動機構を介して伝動連結してなる、偏心式フェーシングユニット。A tool shaft mounting shaft that is rotationally driven by a tool driving shaft is eccentrically mounted on the spindle, and a tool shaft that is connected to the tool shaft mounting shaft so as to rotate at the same speed via an Oldham coupling mechanism , Mount the tool shaft mounting shaft with the same amount of eccentricity with respect to the spindle, and rotate the tool shaft mounting shaft and the tool drive shaft at twice the angle of the tool shaft where the tool shaft mounting shaft rotates at the same speed as the tool drive shaft. Thus, an eccentric type facing unit that is connected by transmission through a gear transmission mechanism.
JP2001177889A 2001-06-13 2001-06-13 Eccentric facing unit Expired - Lifetime JP3751223B2 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
JP2001177889A JP3751223B2 (en) 2001-06-13 2001-06-13 Eccentric facing unit
US09/992,118 US6565298B2 (en) 2001-06-13 2001-11-05 Eccentric facing unit
KR1020020003525A KR100821285B1 (en) 2001-06-13 2002-01-22 Eccentric facing unit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2001177889A JP3751223B2 (en) 2001-06-13 2001-06-13 Eccentric facing unit

Publications (2)

Publication Number Publication Date
JP2002370103A JP2002370103A (en) 2002-12-24
JP3751223B2 true JP3751223B2 (en) 2006-03-01

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JP2001177889A Expired - Lifetime JP3751223B2 (en) 2001-06-13 2001-06-13 Eccentric facing unit

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JP (1) JP3751223B2 (en)
KR (1) KR100821285B1 (en)

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KR20020095032A (en) 2002-12-20
KR100821285B1 (en) 2008-04-10
US20020189412A1 (en) 2002-12-19
US6565298B2 (en) 2003-05-20
JP2002370103A (en) 2002-12-24

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